全部,
这是我第一次在这里发帖 -- 过去几天我搜索了几个小时。这不是我制作的第一个客户端/服务器应用程序,我完全不知道出了什么问题。
我有一个 Java 服务器(它能够正确读取来 self 的 iOS 客户端的请求——它甚至生成一个响应并似乎正确发送它,尽管在 iOS 客户端上没有数据可供读取):
public void run() {
BufferedReader in;
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
OutputStream out_stream = this.socket.getOutputStream();
StringBuilder request = new StringBuilder();
String request_buffer;
while ((request_buffer = in.readLine()) != null) {
request.append(request_buffer);
}
out_stream.write(processRequest(request.toString()).getBytes());
out_stream.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
提供的 Java 函数是作为其所属类的实例的结果而被调用的,并且它是用 ServerSocket 的 accept() 方法的结果初始化的。这里的一切似乎都运行良好——以下 Python 客户端能够发送请求(甚至读取响应):
DEFAULT_HOST = ''
DEFAULT_PORT = 2012
RECEIVE_BUFFER_SIZE = 4096
if __name__ == "__main__":
import sys, socket
port = DEFAULT_PORT
host = DEFAULT_HOST
if len(sys.argv) > 2:
host = sys.argv[1]
del sys.argv[1]
if len(sys.argv) == 2:
request = sys.argv[1]
print "Requesting: %s" % request
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.send(request)
s.shutdown(socket.SHUT_WR)
response = ""
message = True
while message:
message = s.recv(RECEIVE_BUFFER_SIZE)
response += message
print "Response: %s" % response
在发布 iOS 客户端之前,我已经使用以下 Python 服务器对其进行了测试(并且 iOS 客户端可以按预期进行读/写。这也适用于 Python 测试客户端):
import os, sys
DEFAULT_HOST = ''
DEFAULT_PORT = 4150
# Simple test server
DEFAULT_SIZE = 4096
import socket
class Server:
def __init__(self, host, port, root, protocol, debug=True):
self.debug = debug
self.host = host
self.port = port
self.root = root
self.protocol = protocol
def __call__(self):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((self.host, self.port))
s.listen(5)
while True:
try:
c = s.accept()
print "Connection: %s" % str(c)
request = c[0].recv(DEFAULT_SIZE)
print "Request: %s" % request
try:
response = "test"
if self.debug:
print "Response: %s" % response
except Exception as ex:
print "Error generating response: %s" % ex
if response:
c[0].send(response)
else:
c[0].send("3rr0rZ")
c[0].close()
print
except Exception as ex:
print ex
if __name__ == "__main__":
host = DEFAULT_HOST
port = DEFAULT_PORT
args = sys.argv
# choose a port
if len(args) > 1 and args[1] == "-p":
if len(args) < 3:
raise Exception("Missing Argument for %s" % "-p")
port = int(args[2])
del args[1:3]
else:
port = DEFAULT_PORT
# check if root specified
if len(args) > 1:
root = os.path.realpath(args[1])
del args[1]
else:
root = os.getcwd()
print "Using:"
print "\tHost: %s" % host
print "\tPort: %s" % port
print "\tRoot: %s" % root
print
server = Server(host, port, root)
server()
显然这是一个简化的服务器——问题不在于如何生成请求。关于更多背景知识,请求和响应是 JSON 字符串,尽管这并不完全相关。如前所述,Python 客户端能够成功地请求和接收来自 Java 和 Python 服务器的响应。 iOS 客户端可以成功向 Python 和 Java 服务器发送请求,但它只能从 Python 服务器读取响应。这是 iOS 客户端的相关部分:
- (NSData *)sendMessage:(NSData *)request
{
// Create low-level read/write stream objects
CFReadStreamRef readStream = nil;
CFWriteStreamRef writeStream = nil;
// Create high-level stream objects
NSInputStream *inputStream = nil;
NSOutputStream *outputStream = nil;
// Connect the read/write streams to a socket
CFStreamCreatePairWithSocketToHost(nil, (__bridge CFStringRef) self.address, self.port, &readStream, &writeStream);
// Create input/output streams for the raw read/write streams
if (readStream && writeStream) {
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
inputStream = (__bridge_transfer NSInputStream *)readStream;
[inputStream open];
outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[outputStream open];
}
NSLog(@"Sending message to server: %@", request);
[outputStream write:[request bytes] maxLength:[request length]];
[outputStream close];
int size;
int buffer_size = 1024;
uint8_t buffer[buffer_size];
NSMutableData *response = [NSMutableData dataWithLength:0];
while (![inputStream hasBytesAvailable]);
NSLog(@"About to read");
while ([inputStream streamStatus] == NSStreamStatusOpen)
{
if ([inputStream hasBytesAvailable] && (size = [inputStream read:buffer maxLength:buffer_size]) > 0)
{
NSLog(@"Reading response data");
[response appendData:[NSData dataWithBytes:buffer length:size]];
}
}
NSLog(@"\tResponse:%@", response);
return response;
}
从 Java 服务器读取时,iOS 客户端永远不会越过以下行:
while (![inputStream hasBytesAvailable]);
我已经阅读了所有可以找到的各种搜索词的文档、论坛帖子、问题等,但没有任何帮助;我希望这里有人可以阐明这个问题!我已经发布了我正在使用的代码的一个稍微简化/扁平化的版本,但是,同样,这应该足以建立上下文。如果有必要,我会很乐意发布更多代码,我感谢任何帮助或见解你可以分享。
我故意不使用 NSStreamDelegate,我无法想象这是一个问题。如果我是,我会想象问题会简单地转化为永远不会发生的 NSStreamEventHasBytesAvailable。
最佳答案
试试我的代码,它对我有用。
NSInputStream *inputStream;
NSOutputStream *outputStream;
-(void) init{
NSURL *website = [NSURL URLWithString:@"http://YOUR HOST"];
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL,CFBridgingRetain([website host]),9876, &readStream, &writeStream);
inputStream = (__bridge_transfer NSInputStream *)readStream;
outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream open];
[inputStream open];
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
}
- (void) sendMessage {
// it is important to add "\n" to the end of the line
NSString *response = @"Say hello to Ukraine\n";
NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSUTF8StringEncoding]];
int sent = [outputStream write:[data bytes] maxLength:[data length]];
NSLog(@"bytes sent: %d",sent);
do{
uint8_t buffer[1024];
int bytes = [inputStream read:buffer maxLength:sizeof(buffer)];
NSString *output = [[NSString alloc] initWithBytes:buffer length:bytes encoding:NSUTF8StringEncoding];
NSLog(@"%@",output);
} while ([inputStream hasBytesAvailable]);
}
public class ServerTest {
public static void main(String[] args) {
Thread thr = new Thread(new SocketThread());
thr.start();
}
}
class SocketThread implements Runnable {
@Override
public void run() {
try {
ServerSocket server = new ServerSocket(9876);
while (true) {
new SocketConnection(server.accept()).start();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
class SocketConnection extends Thread {
InputStream input;
PrintWriter output;
Socket socket;
public SocketConnection(Socket socket) {
super("Thread 1");
this.socket = socket;
try {
input = socket.getInputStream();
output = new PrintWriter(new OutputStreamWriter(
socket.getOutputStream()));
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void run() {
try {
byte array[] = new byte[1024];
while (true) {
do {
int readed = input.read(array);
System.out.println("readed == " + readed + " "
+ new String(array).trim());
String sendString = new String(
"Hello Ukraine!".getBytes(),
Charset.forName("UTF-8"));
output.write(sendString);
output.flush();
} while (input.available() != 0);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
关于java - 无法使用 NSInputStream 在 iOS 客户端中读取来自 Java 服务器的响应,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9660388/